Using radar sensors to measure and maintain required distance to vehicle ahead by braking and accelerating. Set via steering column controls of the cruise control system. Includes Audi braking guard – a system which triggers a visual and acoustic alarm when it detects the risk of a rear end collision with the vehicle in front. At speeds below 19mph the system can initiate partial braking or full deceleration if a potential impact is detected to help prevent a collision, or if it is not possible to completely prevent a collision, the system will focus on reducing the speed at which the vehicles collide